diff options
| author |   Andrew Victor <andrew@sanpeople.com> | 2007-05-03 12:26:24 +0100 |
|---|---|---|
| committer |   Russell King <rmk+kernel@arm.linux.org.uk> | 2007-05-03 14:12:45 +0100 |
| commit | 03abeac0a222060ae8f02e8359c285df0971437e (patch) | |
| tree | 96fd9e6f11740a098ffa0958d218ff1f41e4b216 /drivers/serial/atmel_serial.c | |
| parent | [ARM] 4354/1: AT91: Support ADS7846 touchsceen on SAM9263-EK board (diff) | |
| download | linux-dev-03abeac0a222060ae8f02e8359c285df0971437e.tar.xz linux-dev-03abeac0a222060ae8f02e8359c285df0971437e.zip | |
[ARM] 4357/1: AT91: Support slower serial baud-rates
Allow slower serial baud-rates by switching the UART clock from MCK to
MCK/8.
Based on patches by Mike Wolfram and Russell King.
Signed-off-by: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/serial/atmel_serial.c')
| -rw-r--r-- | drivers/serial/atmel_serial.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/serial/atmel_serial.c b/drivers/serial/atmel_serial.c index 935f48fa501d..3320bcd92c0a 100644 --- a/drivers/serial/atmel_serial.c +++ b/drivers/serial/atmel_serial.c @@ -484,11 +484,16 @@ static void atmel_set_termios(struct uart_port *port, struct ktermios * termios, unsigned long flags; unsigned int mode, imr, quot, baud; + /* Get current mode register */ + mode = UART_GET_MR(port) & ~(ATMEL_US_USCLKS | ATMEL_US_CHRL | ATMEL_US_NBSTOP | ATMEL_US_PAR); + baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); quot = uart_get_divisor(port, baud); - /* Get current mode register */ - mode = UART_GET_MR(port) & ~(ATMEL_US_CHRL | ATMEL_US_NBSTOP | ATMEL_US_PAR); + if (quot > 65535) { /* BRGR is 16-bit, so switch to slower clock */ + quot /= 8; + mode |= ATMEL_US_USCLKS_MCK_DIV8; + } /* byte size */ switch (termios->c_cflag & CSIZE) { |